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Related Concept Videos

Polytene Chromosomes02:04

Polytene Chromosomes

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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Lampbrush Chromosomes01:51

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
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Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

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The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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Chromosomal Theory of Inheritance01:39

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In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
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Chromosome Preparation From Cultured Cells
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Chromothripsis - Extensive Chromosomal Rearrangements and Their Significance in Cancer.

K Závacká, K Plevová, M Jarošová

    Klinicka Onkologie : Casopis Ceske a Slovenske Onkologicke Spolecnosti
    |April 19, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Chromothripsis, a process causing massive chromosome shattering and reassembly in a single event, is linked to cancer and congenital disorders. Understanding its mechanisms may improve personalized cancer treatment strategies.

    Keywords:
    DNADNA end-joining repairchromosomeschromothripsisgenomic structural variationmutationneoplasms

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    Area of Science:

    • Genomics
    • Cancer Biology
    • Molecular Genetics

    Background:

    • Chromosome rearrangements are crucial in cancer development.
    • Chromothripsis, characterized by massive chromosomal fragmentation and chaotic reassembly, is a proposed mechanism.
    • This process can lead to oncogene activation or tumor suppressor inactivation, impacting cancer pathophysiology.

    Purpose of the Study:

    • To consolidate current knowledge on chromothripsis.
    • To detail its features, origins, cellular impacts, and associated diseases, with a focus on cancer.
    • To explore its potential in optimizing personalized cancer therapies.

    Main Methods:

    • Literature review and synthesis of existing research on chromothripsis.
    • Analysis of proposed mechanisms, including DNA damage in micronuclei.
    • Compilation of data on chromothripsis occurrence in various tumor types and congenital disorders.

    Main Results:

    • Chromothripsis involves extensive structural variants arising from a single catastrophic event.
    • It is frequently observed in brain and bone tumors, as well as congenital disorders.
    • While the exact origin is unclear, DNA damage within micronuclei is a leading hypothesis.

    Conclusions:

    • Chromothripsis represents a distinct mechanism of genomic instability contributing to disease.
    • Its association with unfavorable prognosis warrants further investigation.
    • Harnessing knowledge of chromothripsis could lead to novel, personalized treatment approaches for affected individuals.